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Leases - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 01, 2020
Aug. 15, 2019
USD ($)
RenewalOption
Jul. 04, 2019
Apr. 12, 2019
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee Lease Description [Line Items]                  
Incremental borrowing rate for purposes of calculation of lease liabilities         11.50%   11.50%    
Change in incremental borrowing rate             1.00%    
Short-term lease payments         $ 1,475   $ 1,475    
Monthly rent payment         18,126   18,126    
Operating lease liability         10,600   10,600   $ 9,800
Operating lease right-of-use asset         8,149   8,149   $ 8,511
Operating lease expense         $ 400 $ 400 $ 1,200 $ 1,100  
Dublin | Office Centre Sharing Agreements                  
Lessee Lease Description [Line Items]                  
Description of lease agreement             On April 12, 2019 the Company entered into an Office Centre Sharing Agreement for office space in Dublin, Ireland effective May 1, 2019 was scheduled to terminate on April 30, 2020 and was extended for one additional year through April 30, 2021 and can continue to be extended automatically for successive one year periods. On July 4, 2019, the Company entered into an Office Centre Sharing Agreements effective October 1, 2019 for office space in Dublin, Ireland was scheduled to terminate on September 30, 2020 and was extended for one additional year through April 30, 2021 and can be extended automatically for successive one year periods. On August 1, 2020 the Company entered into an Office Centre Sharing Agreement effective September 14, 2020 for office space in Dublin, Ireland which terminates on April 30, 2021 and can be extended automatically for successive one year periods.    
Operating lease, expiration date Apr. 30, 2021   Sep. 30, 2020 Apr. 30, 2020          
Lease renewal term         1 year   1 year    
Operating lease, option to additional extend             extended for one additional year through April 30, 2021 and can continue to be extended automatically for successive one year periods    
Lease termination existence of option to extend             true    
Operating lease, existence of option to extend [true false]             true    
Operating lease, option to extend             On July 4, 2019, the Company entered into an Office Centre Sharing Agreements effective October 1, 2019 for office space in Dublin, Ireland was scheduled to terminate on September 30, 2020 and was extended for one additional year through April 30, 2021 and can be extended automatically for successive one year periods. On August 1, 2020 the Company entered into an Office Centre Sharing Agreement effective September 14, 2020 for office space in Dublin, Ireland which terminates on April 30, 2021 and can be extended automatically for successive one year periods.    
Short-term lease payments         $ 100   $ 100    
Dublin | Office Centre Sharing Agreements Effective May 1, 2019                  
Lessee Lease Description [Line Items]                  
Operating lease, expiration date       Apr. 30, 2021          
Bridgewater                  
Lessee Lease Description [Line Items]                  
Description of lease agreement             Amarin will have a one-time option to terminate the agreement effective on the first day of the ninety-seventh month after the Commencement Date upon advance written notice and a termination payment specified in the Lease.    
Lease renewal term   5 years              
Lease termination existence of option to extend   true              
Lease commencement date   Aug. 15, 2019              
Lease agreement term   11 years              
Number of renewal options | RenewalOption   2              
Lease termination description             one-time option to terminate the agreement effective on the first day of the ninety-seventh month after the Commencement Date    
Monthly rent payment   $ 100              
Maximum                  
Lessee Lease Description [Line Items]                  
Short term lease period             12 months